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Picture 1 of 13
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Opal Identification and Value by Paul B. Downing (2003, Hardcover, Revised edition,Expanded)
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The world standard is back by popular demand! Learn to properly identify opals from all over the world. Ascertain if the opal is a natural solid, boulder, doublet, triplet, dyed or lab-created. Learn what to look for in properly set jewelry.